The authorities said one of the trains was carrying liquified petroleum gas.

Liquified petroleum gas was used for cooking, heating and lighting.

The surrounding region produces petroleum, natural gas, bitumen and salt.

In the early 1960s, markets for liquid petroleum gases grew rapidly.

Also many kitchens run on liquefied petroleum gas available in steel bottles.

Some fire mitigation measures are listed under liquefied petroleum gas.

Energy rose 8.8 percent, including a nearly 50 percent jump for liquefied petroleum gas.

The railroad's main traffic sources are petroleum gas and agricultural products.

One train was reported to be carrying gasoline and another liquefied petroleum gas.

Smaller quantities of liquefied petroleum gas are transported by road.